PROBLEM 17
No swing operation, but engine loads.
POSSIBLE CAUSES
Mechanical hang-up. Solenoid failure. Wiring fault.
CHECKS
Check swing operation in both directions with brake released.
Slight Swing Movement No Swing Movement
Check for voltage to brake solenoid with
swing park brake switch in OFF position.
Voltage
No Voltage
Repair or replace wiring.
Check solenoid coils for magnetism with screwdriver.
Magnetic
Not Magnetic
Replace valve.
Replace valve.
YesNo
Enable manual override on brake valve. (See Test 26—Actuating
the Solenoid Valve Manual Overrides.) Does swing brake
release?
Is swing brake release pressure 24 bar (350 psi) or
greater? (See Test 15—Checking System Voltage at the
Hydraulic Valve Assemblies.)
Check pressure at brake assembly with a
0 to 35 bar (0 to 500 psi) gauge. (See Te st 2 3 —
Checking the Hydraulic Brake Pressure.)
300 psi or More300 psi or Less
Yes
No
No
Replace relief valve or pump.
Set pump charge pressure relief to 24 bar (350 psi). (See Te st
18—Adjusting the Pump Charge Pressure Relief.) Is 24 bar
(350 psi) obtained?
Repair or replace brake valve.
Repair or replace brake.
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